On Wed, Jun 15, 2011 at 10:07 PM, Fajar Priyanto <fajarpri at arinet.org> wrote: > > Btw, I've checked. My room humidity is 23%. That should be ok, > shouldn't it? But still I saw the spark. Very early in this thread Benjamin Franz posted this: "Low humidity would be my first guess. The relative humidity in your server room should be between 50% +/- 10%. Too high and you can get condensation. Too low and you get electrostatic discharges." Did you miss that message? Mike